Speed boat



Jan. 12, 1932. I I s. LAKE 1,840,725

SPEED BOAT Filed June 26, 1930 M7220 Lake Patented Jan. 12, 1932MILTONVS. LAKE, or DALLAS, TEXA$ 1 SPEED BoAr Application filed June as,1930. Serial irog ieiml.

This invention relates to new and useful improvements in anti-frictionattachments for speed boats.

One object of the inventionis to provide friction eliminating means forthe second step of a speed boat whereby less resistance will he offeredto the forward movement of the boat when the latter is riding on itssecond step at high speed.

A particular object of the invention is to provide transverse rollers,each extending substantially the entire width of the bottom of the boatand spaced in such close relation as to provide substantially no spacetherebetween except for'olearance whereby the entire surface presentedto the water will revolve. i Another object of the invention is toarrange the forward rollers on the second step so as to project belowthe heel of the first step so as totake the forward thrust or impact andthus accelerate the rate of speed at which the boat moves through thewater.

A construction designed to carry out the invention will be hereinafterdescribed together with other features of the invention.

The invention will be more readily understood from a reading of thefollowing specification and by reference to the accompanyingdrawings inwhich an example of the invention is shown, and wherein:

Figure 1 is a side elevation of a speed boat having mounted thereon anattachment con structed in accordance with the invention.

Figure 2 is a perspective view showing the mounting of the rollers onthe boat,

Figure 3 is a transverse vertical sectional View taken on line 3-3 ofFigure 1,

view taken on line 44 of Figure 3,

and

Figure 6 is a detailed sectional view of the Figure 4c is a partiallongitudinal sectional Figure 5 1s a view slmilar to Figures, showing amodified form of rollermounting7 'of the bottom of the second step, asbest shown in Figure 2. As shown in Figure; 6 the ends 15 of eachroller. are-reduced and are ournaled inpballebearings 16; iofbearinghangers 17 which are'secured to and depend from the sides of theboat.

The forward roller 14 is positioned directly behind a heel 18 which isformed beexcept for clearance so.that the entire surface presented tothe water at a high rate of H speed ofthe boat will revolve. In thismanner less resistance is offered to the forward movement of the boatwhen the latter is riding on its second step and the rate of speed atwhich the boat movesthrough the water is accelerated.

It is pointed out that asthe boat increases its speed' the water willbecome more solid and with the rollers taking the forward thrustorimpact, they will ride upon the water and so lessen to a great extentthe drag of the boat.

In Figure 5 I have shown a modified for of roller mounting in which thebottom 19 of the boat is corrugated to conform to the rollers so as toprovide substantially no space therebetween except for clearance.

Various changes in the size and shape of the different parts, as well asmodifications scope of the appended claims.

What I claim, is: 1. A boat hull including a bottom surface comprising arelatively smooth forward portion adapted to make sliding contact withthe water underthe boat when the .boat is propelled relatively slowly,and a second porits and alterations,-may be made within the adapted tomake rolling contact with the water.

2. A boat hull as claimed in claim 1, in which the second portionextends over all of the area of the bottom which is adapted to contactwith the Water when the boat is propelled at relatively high speed.

3. A boat hull including a two step bottom surface, the forward stepbeing relatively smooth and adapted to make sliding contact with thewater, and a plurality of freely rotatable transverse rollers mounted.

in tandem arrangement on the rear step and adapted to make rollingcontact with the water, the forward roller being positioned immediatelybehind the heel of the forward step and depending slightly below thelevel of the forward step.

In testimony whereof, I affix my signature.

MILTON S. LAKE.

